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4-42 Configuring Your Server
RAID5
In RAID5, data is distributed to hard disk drives by striping and, at the same time, the parity
(redundant data) is distributed to the hard disk drives. This mode is called "striping with distributed
parity".
Each of stripe x, stripe x+1, and parity (x, x+1) created from stripe x and stripe x+1 is written onto a
specific hard disk drive. Accordingly, the total capacity assigned to the parity is just the same as the
capacity of a single hard disk drive. If any one of the hard disk drives configuring a logical drive is
defected, data is still available with no problems.
RAID Controller
HDD 1
HDD 2
HDD 3
Stripe 2
Parity (3, 4)
Stripe 5
Parity (1, 2)
Stripe 3
Stripe 6
Stripe 1
Stripe 4
Parity (5, 6)
RAID6
A RAID 6 extends RAID 5 by adding an additional parity block (Q) created by different calculation
method such as weighting by some factor, thus it uses block-level striping with two parity blocks
distributed across all member disks. This mode is called "striping with duplex and distributed
parity". Accordingly, the total capacity assigned to the parity is just the same as the capacity of two
hard disk drives. If any two of the hard disk drives configuring a logical drive are defected, data is
still available with no problems.
RAID Controller
HDD 1
HDD 2
Stripe 1
HDD 3
Stripe 4
Stripe 2
Parity P (3,4)
Parity P (1,2)
Parity Q (3,4)
Parity P (5,6)
Parity Q (5,6)
Stripe 5
HDD 4
Parity Q (1,2)
Stripe 3
Stripe 6
Parity Q (7,8)
Stripe 7
Stripe 8
Parity P (7,8)
Summary of Contents for N8100-1668F
Page 60: ...2 28 General Description This page is intentionally left blank ...
Page 146: ...5 8 Installing the Operating System with Express Setup Flow of Setup ...
Page 173: ...Installing the Operating System with Express Setup 5 35 Flow of Setup ...
Page 255: ...Installing and Using Utilities 6 13 Windows Server 2003 ...
Page 282: ...7 14 Maintenance This page is intentionally left blank ...
Page 339: ...Troubleshooting 8 57 When you use a remote console 6 Each tool is selected and it starts ...
Page 422: ...9 78 Upgrading Your Server This page is intentionally left blank ...
Page 440: ...C 2 IRQ This page is intentionally left blank ...
Page 464: ...D 24 Installing Windows Server 2008 R2 4 Activate Windows The Windows activation is complete ...
Page 495: ...Installing Windows Server 2008 E 29 4 Activate Windows The Windows activation is complete ...
Page 558: ...H 2 Using a Client Computer Which Has a CD Drive This page is intentionally left blank ...
Page 568: ...I 10 Accessing Power and Performance Data This page is intentionally left blank ...
Page 572: ...J 4 Product Configuration Record Table This page is intentionally left blank ...